The large blood vessel that brings deoxygenated blood from the body to the heart is the

List the structures of the electrical conduction system of the heart beginning with where the impulse starts. 

An animal’s first line of defense against potential disease-causing organism is the

The heart is in the thoracic cavity in the space between the two lungs. This space is called the

Deoxygenated blood from systemic circulation enters the heart at the 

Consider the Venn diagram: Which of the following sets represent(s) the red region? (1)

Consider the function defined by the following arrow diagram: (1) What is the domain of  ? [a1] (2) What is the codomain of  ? [a2] (3) What is the range of  ? [a3] (4) Is  one-to-one? [a4] (5) Is  onto? [a5]

(6 points for the correct answer; 2 bonus point if you have correctly answered a total of 9 questions among questions 1 through 11.)  Consider the following proof of the fact that the sum of any two even integers is even:  Suppose  and  are any even integers. By definition of even,   and  for some integers  and . Then . Note that  is an integer because the sum of two integers is an integer. Hence  is an even integer by definition of even.  Is the proof valid? 

(6 points for the correct answer; 2 bonus point if you have correctly answered a total of 9 questions among questions 1 through 11.)  Consider the following proof of the fact that the product of any two odd integers is odd:  Suppose  and are any odd integers. By definition of odd,   and for some integers and . Then . Note that is an integer because the sums and products of integers are integers. Hence  is an odd integer by definition of odd.  Is the proof valid? 

(1) For any integers  and , if  and , then